Question License plates are required to be: Answers Displayed horizontally. Fastened in a way to prevent swinging. Clean and visible at all times. All of the above. Explanation License plates must be fastened horizontally at least 12 inches from the ground and in a manner that prevents swinging. They must be clearly visible and kept clean and legible. Pass your DMV Written Test with flying colors Take me to the cheat sheet Colorado This questions appears in the following tests: Colorado Practice Test 21 Colorado Practice Test 8